Please help I don't know where to look for the fuse and where to purchase it and how much they would be. I am a contractor and am very handy I know I could change it I just don't know where to buy or where to look to change in microwave. Thank you in advance for your help.

See
Parts for MMV4205AAW | Maytag | Microwaves (http://www.appliancefactoryparts.com/microwaves/maytag/mmv4205aaw.html)

Seventh image, Interior Parts (II-I), key number 5001.

Looks like common time delay fuse, Doesn't give size. Cost $7.13. Available Radio Shack, hardware store, appliance parts store or online.

Be careful about touching capacitors, high voltage even with power disconnected..